I think it has to do a lot with his game presence. Most people prefer to go into a head on teamfight late game and not playing some fortress game with tons of shrooms. Besides that i think there are better characters for top. I rather have a proper tank or assasin at top than teemo.

And he steals a lot of kills, witouth actually being able to carry the game....

The drugs have so much power over it that it can't do anything without abusing those drugs.

It's because it has the wrong mindset and runs away from problems instead of facing them.

That makes it a bad role model.

It injects drugs into you literally every single time it attacks you.

Even if you don't want it any harm, you will get blown up in a poison smoke explosion of pain.

It also takes your fertility from what I've taken, so there is no going back to being how you were in the past once you encounter teemo.

Approaching it is neither possible and definitely not adviced either.

despite of this I tried to talk to it once but it didn't want to listen.

Ignorance is a sin you know? It also shows how much of an egocentric douche one is.

The passive aggressiveness in it's speach doesn't do good either.

"Never underestimate the power of the scout's code."

This one sentence just reeks of disgust at everyone whose attitude differs from it's own.

It can't be bargained with. It can't be reasoned with. It doesn't feel pity, or remorse, or fear. And it absolutely will not stop, ever, until you are dead.

I have heared about countless people being changed forever after encountering this hateful, scornful, relentless, merciless murderer.

They are in mental home right now.

People try to cover up their fear of it with hate, but the fact remains that this avatar of hatred and burning vengeance is never going to stop in his wakes is what strikes fear into the hearts of people and they try anything to at least continue their normal lifestyle without the fear of getting hunted down and mercilessly murdered.